膨胀土地区深基坑围护结构稳定性分析

Analysis of Stability of Deep Foundation Pit Envelope in Expansive Soil Area

以合肥地铁5号线四川路站深基坑为背景,为典型的中等偏弱性膨胀土地区深基坑工程。首先,通过现场基坑监测获得大量的监测数据并加以分析处理,得到基坑桩顶水平位移和桩体深层水平位移的变化规律。然后,通过数值模拟计算得到加载不同膨胀力情况下的桩顶水平位移和桩体深层水平位移计算结果。最后,将模拟结果与现场监数据进行分析比较,结果表明两者基本吻合,数值计算结果具有一定的可靠性和合理性。

Based on the foundation pit project of Sichuan Road Station of Hefei subway line 5, this is a typical deep foundation pit project in middle-weak expansive soil area. First of all, a large number of monitoring data were obtained and analyzed through on-site foundation pit monitoring, then the change rule of horizontal displacement of pile top and deep horizontal displacement of pile body is found. And then, Different horizontal displacement of pile top and deep horizontal displacement of pile body are obtained by exerting different expansion force value through numerical simulation. Finally, a comparation was made between the simulation results and on-site monitoring data. The result suggests that numerical results are in good agreement with on-site monitoring results. Thus, the results of numerical calculation are certainly reliable and rational.